Course Details
Subject {L-T-P / C} : MN6124 : Design of Underground Structures { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Dr. Sahendra Ram
Syllabus
Module1:
Natural support Design of rhombus and inclined coal pillar. Geological and geometric factors involved in design of natural supports. Design of fender/rib/snook. Roof-coal pillar interaction. Application of numerical modelling for design of the natural supports. [12 Hours]
Module 2:
Applied support: Support systems for continuous miner based mechanised workings and longwall working. Active and passive support, Failure mechanism of roof/cable/flexi bolts. Short Encapsulation Pull-out Test (SEPT) for resin grouted rock bolts. Application of numerical modelling for design of the applied supports. [12 Hours]
Module 3:
Roadways: Cut-out distances during continuous miner-based working, Factors affecting the design of roadways- Depth of cover, in-situ stress conditions, nature of over- and under-lying strata, gradient of coal seam, orientation of geological discontinuities, etc., Applicability of continuous miner and bolter miner. [6 Hours]
Module 4:
Goaf behaviour: Caving characteristics of overlying strata, Caveability Index, Roof falls, Line of extraction, Induced stress driven fracturing/spalling in natural supports. Bulking factor of overlying strata and its significance, Caving angle, Angle of draw, Induced stress management, Estimation of active mining zone during depillaring operations. [6 Hours]
Course Objectives
- To understand the newly designed approaches for different structures of underground mines for safe and efficient extraction of coal.
- To understand design of recent advancement in applied support system for underground coal mining.
- To understand strata mechanics involved during continuous miner based mechanised working
Course Outcomes
CO1: It will provide knowledge to students for suitable design of different underground structures during semi-mechanised and mechanised workings in underground coal mine. <br />CO2: Students will be familiar with the recent developed technologies including applied support for underground coal mining <br />CO3: Apply different support systems for stability of working places in underground coal mine. <br />CO4: Strata management skill during depillaring with caving under different nature of roof strata
Essential Reading
- J.M. Galvin, Ground Engineering - Principles and Practices for Underground Coal Mining, Springer International Publishing AG Switzerland, 2016
- 2. S.S. Peng, Longwall Mining, 3rd Edition, published by CRC Press, 2021
Supplementary Reading
- 1.John A. Hudson and John P. Harrison, Engineering Rock Mechanics- An introduction to the principles, Elsevier, 2007
- 2. R.D. Singh, Principles & Practices of Modern Coal Mining, New age international New Delhi, 1997
Journal and Conferences
- International Journal of Rock Mechanics and Mining Sciences (IJRMMS)
- Rock Mechanics and Rock Engineering (RMRE)